Ezra t



(No Model.)

E. T. GILLILAND.

ARMATURE FOR MAGNETO ELECTRIC MACHINES.

Patented Jan.Z8,1883.

m VENTOR.

UNITED STATES EZRA 'l. GILLILAND, ()F

PATENT OFFICE.

INDIANAPOLIS, INDIANA.

SPECIFICATION forming part of Letters Patent No. 270,945, dated January 23, 1823,

Application filed October 10, 1882.

essary, as is well known, to maintain the per-.

feet insulation of the several convolutions of the wire composing the helix from each other, as any metallic contact between any of said convolutions will reduce the operative size of the helix, and to thatextent impair thestrength of the generator.

The helix, when constructed in the ordinary manner, bein g unproteoted,except by the usual fibrous wrapping upon the wire, of which it is composed, is liable to be impregnated with alltheconvolutions being cut out or short circuited, between which such electrical coir iiection is established. In other cases (the wire composing the helix not usually being wound tightly enough to prevent it) there is a certain vibration of the convolutions of wire as the armature revolves, which causes the same to rub against each other, abrading the covering of said wire and allowing some of the convolutions to come in contact with each other, the ett'ect being, as before, to short-circuit a portion of the helix.

My said invention therefore consists principally in sojacketing the helix of the rotary armature of a magneto-electric generator after it is wound upon its core as to prevent extraneous substances from getting among the convolutions thereof, to prevent the chafing of the covering of the wire composing it, and generally to obviate all thoseimperfections which (No model.)

have heretofore resulted from its unprotected state.

It further consists of some details of construction and arrangement by which the armature is improved and its cost reduced.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure -l is avertical section on the dotted line 2 c, Fig. 2, through a call-signal apparatusfor telephonic purposes embodying my said invention; Fig. 2, avertical section thereof transversely of Fig. l on the dotted line y same on the dotted line so a Fig. 2; and Fig. 4, a perspective view of the armature separately;

In said drawings, theportions marked A repa magneto -electric generator; B, the polepieces thereof; C 0 &c., the various portions of the rotary armature; D, the-cylinder-heads, and E contact-springs whereby the electrical circuit is established through the armature.

The magnets A, pole pieces B, cylinderheads D, and contact-springs E may be constructed in any ordinary or suitable form, and need no special description.

The armature is constructed in the following manner: Upon the core 0 the helix 0 is wound in the usual manner, except that the core does not extend into a shaft for the armature, and therefore the space ordinarily occupied by the shaft portions can be filled with additional wire and the strength of the apparatus in proportion to its size thus increased. After the helix is properly wound, paraftine or some similar fusible insulating material is introduced into the interstices therein, a wrapping, G of asbestus paper or some similar material capable of resisting the action of heat, is placed thereon, the whole is placed in a mold, and the intervening space is filled with molten white or other suitable metal, which, when cooled, entirely envelops' the helix, (except the end by which the electrical connection is formed,) forming a jacket, 0 which completely protects it from all extraneous substances and holds it so firmly that any chafing or rubbing of the wires together is impossible.

3 Fig. 1; Fig. 3, a horizontal section of the '6 resent the permanentor horseshoe magnets of ICO The paraffine which is introduced into the helix makes it mechanically practically solid, and the asbestos paper not only resists the action of heat during the casting of thejacket thereon, but serves as a means for the more perfect insulation of said helix.

The mold is so formed that the metal extends out at each end and forms journals for the armature. In each end of the mold, before the casting takes place, is placed a small hardmetal (preferably steel) ring or collar, 0 into which the metal runs, and thus, when the device is finished, thejournals are covered with a much more durable metal than that of which they are principally composed, and are ren- (lered as desirable in this respect as if the harder metal were used throughout, and at a small portion of the expense.

Onejournal is bored or cast hollow, as usual, and insulating material inserted, through which is passed a pin, 0 to lead off the electric current from the generator. By reason of the other unusual features of this armature, however, the construction is somewhat diiferent. An open space extends down through the armature at theend where the hollow journal is attached, which is also lined with insulating material. A bar, 0 is placed in this space and rests against the pin a. The

end 0 of the wire composing the helix is attached to this bar, and thus completes the electrical connection.

In the drawings the distinctively insulating material spoken ofin this specification is distinguished from the metal or other parts by being shown in solid black.

It will be understood that modifications in the construction or form of this armature may be made without departing from myinvention, so long as the helix is jacketed, as described, to protect the same.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is v 1. A rotary armature for magneto-electric generators, consisting of the usual core and helix and a metallic jacket cast upon and surrounding said helix, substantially as set forth.

2. An armature consisting essentially of the core 0, the helix G and the jacket 0, sub stantially as set forth.

3. An armature consisting essentially of the core 0, the helix G, and the jacket 0 said jacket being continued to form the journals to the armature, substantially as set forth.

' 4:. The combination of the core, the helix, thejournals, the insulating material, the crossbar 0 and the pin 0 said several parts being arranged and operating substantially as shownand specified.

In witness whereof I have hereunto set my hand and seal, at Indianapolis Indiana, this 6th day of October, A. D. 1882.

EZRA T. G'ILIJILAND. 

